Which type of rock can only form on or very near Earth's surface?
A. Igneous
B. Metamorphic
C. Sedimentary

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

What pattern of migration do whales follow?

In which of the following relationships is one organism always benefited while the other organism is always harmed